Power Electronics
By which one of the following we can measure the reliability of a string?

 Factor of safety.
 String efficient.
  Derating factor.
 Reliability factor.

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Power Electronics
Maximum di / dt in a SCR is

 inversely proportional to Vm of supply voltage.
  directly proportional to Vm of supply voltage.
 both A and C.
 inversely proportional to L in the circuit.

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